Illinois CNA State Practice Exam 2026 - Free CNA Practice Questions and Study Guide

The prefix "Hypo-" generally means "under" and is commonly used in medical terminology to indicate a deficiency or a reduced amount of something. Option B, "above" would be the opposite and the prefix for this would be "Hyper-". Option C, "normal" does not indicate a difference or change in quantity or condition, while option D "rapid" or "fast" would be better represented by the prefix "Tachy-". Therefore, the most appropriate option is A, "under" or "decreased".